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Resistor- Definition, Types, Symbol,Characteristics

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Resistor What is Resistor ? 1. The flow of electric charge through any material encounters an opposing force in many respects to mechanical friction.This opposition force is known as resistance of material. 2. The resistance measure in ohms. 3. An ohm is the resistance that occurs when a current of one amphere passes through a resistor with a one volt drop across its terminals. The current is proportional to the voltage across the terminal ends. This ratio is represented by Ohm's law   Definition 'The opposition to flow of current through any material is know as resistance' "In simple word it passes only selected range of current through material to circuit". Materials use for resistor 1. Tungsten 2. Bronze 3. Ni-chrome 4. Eureka 5 .Manganin 6. Constantan Units The resistance is measured in ohm, for which the symbol is   Ω smallest unit of resistance is and other unit is k Ω  and M Ω. 1 k   Ω   =1 X 1000   Ω  and 1 M ...
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UJT - Unijunction Transistor

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Transistors are normally used for switching . For example ,BJT acts as switch but it has low efficiency and many faults. Therefore UJT and SCR are more useful in electronic circuit for switching purpose. In this article we learn about UJT which has high impedance at off condition and low impedance at on condition. History It was developed by shockley in 1949 from the alloyed germanium bar structure and that time it called as filamentary transistor .The first UJT is in form of bar and then it form in cubr structure at 1994. UJT construction It consist of lightly doped silicon bar and heavily doped p-type material. P type material attached to n type firmly and produces a single P-N junction. In UJT emitter is nearest to base2 than base1. i.e emitter= b1>b2 Symbol UJT has 3 terminals emitter (E),base1 and base2. Emitter is formed by P-type material and base1 and base2 formed by N-type. Emitter arrow indicates emitter current (IE) which decides wheater UJT...
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RISC and CISC

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Before discussing the RISC and CISC we need to understand what instruction set. Instruction Set Instruction set is structure of computer that provides command / Instruction to computer to guide computer for data manipulation. Instruction set consists of instructions, addressing mode, Register and interrupts. Instruction  set connects the software to hardware. Classification of microcontrollers and microprocessor can be done on the basic of RISC and CISC instruction set architecture. What is RISC ? 1) The industry trend for microprocessor design is for  Reduced Instruction Set Computer. 2) When a micro controller has an instruction set that supports fewer addressing modes for the arithmetic and logical instruction and for data transfer instruction the microcontroller is said to be of RISC architecture. Advantages of RISC    1. Performance is better due to simplified instruction set.    2. Can be easily designed.    3. Low cost ...
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